Middlings-purifier



' .-3 Sheets Sheet 1.

(No Model.)

J. A. WAHLSTROM. MIDDLINGS PURIPIER.

yNo. 417,453.

Patented Dee. 17,"'1889.

lll/VENTURI ATTORNEYS N. PETERS. Pholoulhngmplmr, Washington, D. C.

(N Model.) 3 sheets-sheet 2.

J. A. WAHLSTROM.

MIDDLINGS PURIPIER.'

No. 417,453. Patented Deo. 17, 1889.

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(No Model.)A A s sheets-sheet J. A; WAHLSTROM.

MIDDLINGS PURIFIER. l

BT04175153.v Patented Dec. 17, 1889;l

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UNITED STATES PATENT EEICE.

JOHN A. VAHLSTROM, OF VAKEFIELD, NEBRASKA.

IVIIDDLINGS-PURIFIER.

SPECIFICATION forming part of Letters Patent No. 417,453, dated December 1'7, 1889.

Application filed July 20, 1889.

To a/ZZ whom t may concern.-

Be it known that I, JOHN A. WAHLsTRoM, of Wakefield, in the county of Dixon and State of Nebraska, have invented a new and Improved Middlings-Purier, of which the ollowing is a full, clear, and. eXact descripion.

The object of the invention is to provide a new and improved middlings-purier which is simple and durable in construction, very effective in operation, and purifies the middlings with veryv little waste, at the sametime producing middlings of a higher grade.

The invention consists of certain parts and details and combinations of the same, aswill be Hereinafter fully described, and then pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a side elevation of the improvement. Fig. 2 `is a longitudinal sectional elevation of the same. Fig. 3 is an end elevation of the same. Fig. v4 is a sectional end elevation of the same on the line .fr of Fig. l. Fig. 5 is a sectional plan view of part of the improvement on the line y y of Fig. 2, and Fig. 6 is a sectional side elevation of the valves for the fan.

The improved middlings -purifier is provided with a suitably-.constructed casing A,

on one end of which is mounted the main driving-shaft B, connected with suitable inachinery for imparting a rotary motion to the The main driving-shaft B isconnected by a belt and pulleys with a second shaft C, also mounted to turn in suitable bearings in the end of. the casing A and carrying eccentrics D, having their eccentric-rods D' extending to the inside of the casing A and connected with the shaker or bolt E, provided on its bottom with the usual cloth E'. The frame of the bolt E is supported on either side by rods E2, passing loosely through plates E3, on the top of which rest nuts E, screwing on the upper ends of the saidrods E2. The

plates E3 are held longitudinally adjustable by bolts and nuts E5 on standards E, secured on the ouside of the frame, as is plainly shown in Figs.;1 and 4. By adjusting the nuts E4 Serial No. 318,127, (No model.) p

the bolt E may be raised or lowered, and by adjusting` the plates E3 longitudinally the' is connected near its ends by rods F4 with theeccentries D, so' that the rotary motion of the shaft C, operating said eccentrics D, imparts a shaking motion to the troughs F. The latter discharge at their lower ends into aspout G, passing through one end of the casing A and discharging onto the spout H, arranged on the outside of one end of the casing A, as is plainly shown in Fig. 2. The troughs F are also connected .at their upper ends by rods F5 with the bottom I', held loosely on the underside of the hopper I, in which the material is placed. The bottom I is supported by springs l2 from the back of the hopper I, as is plainly shown in Fig. 2.

In the front of the hopper, near the bottom l, is arranged the usual opening I3, adapted to be opened and closed by an adjustable gate I4, servingto regulate the amount of the material passing through the opening I3 onto the shaking bottom I and from the latter into the interior of the casing A. It is understood that the bottoni I' has the saine shaking motion as the troughs F on account of being' rigidly connected with the same.

Into the dust-troughs F F lead the lower ends of the dust-catchers J, preferably six in number, and two being placed alongside each other, as is plainly shown Ain Figs. 2 and 4. Each dust-catcher J is preferably the shape of an inverted cone and slightly inclined, having at its front an upwardly-extending slot J', which is wide at the bottom and narrows toward the top, as shown in Fig. 4. Each set of clust-catchers J is secured on a transversely-extending plate J 2, forming, with the cover A', a channel A2, leading to the sides of the fan K, of any approved construction, and provided with the outlet K', held on the cover A.

IOO

The fan-wheelK is provided with the usual shaft K2, rotated from the main driving-shaft B by a belt or other suitable means.

The channel A2, leading to the sides of the fan-wheel K, can be opened and closed by gates L, secured on the shafts L', mounted to turn in the sides of the cover A', and each provided on one outer end with a crank-arm L2, held adjustably by a bolt and nut L3 in a segmental arm L, fastened on the outside of the cover A'. 3y adjusting the gates L the amount of air passing through the fan K can be conveniently regulated.

On the under side of the bolt E operate a number of brushes N, secured on endless belts N', and adapted to travel, when in their uppermost position, over the horizontallyextending guide-rods N2, adapted to be vertically adjusted so as to press the brushes with more or less force into contact with the under side of the bolting-cloth E'. The endless belts N' pass over suitably-grooved pulleys N3 and N4, fastened in transversely extending shafts N5, mounted to turn in suitable bearings in the casing' A. 'lhe outer end of one of the shafts N5 carries a pulley N6, connected by a belt with a suitable pulley on the main driving-shaft B, so that when the latter is rotated the endless belts-N' are caused to travel and nieve the brushes N against the under side of the bolting-cloth E'.

In the sides of the casing A are arranged longitudinallyextending slatsl O, forming openings suliicientlylarge to admit air to the under side of the bolting-eloth E'.

The stock on the bolt E passes onto the inclined sides P, arranged in the lower part of the casing A and leading to the trough P', in the bottom of which are held a series of gates Q, mounted to slide transversely in suitable bearings formed on the under side of the said trough P. Each of the gates Q is provided with the two openings Q' and Q2, adapted to discharge into the inclines R and R', respectively, held centrally below the trough P' and leading to the conveyingtroughs S and S', respectively, having a forward and backward sliding motion. Each trough S and S' is provided with an opening S2 in its lowermost part to discharge the stock. Each of the gates Q is provided in its middle with a lug Q to prevent the gate from being drawn too far. \\'hen one of the openings Q' or Q2 registers with its corresponding incline R or R', the other opening` is disconnected, so that the stock passes through the registeri11g-opening down its ineline into the respective conveying-trough S or S'. The conveying-troughs S and S are preferably of the shape shown in the drawings, having a bottom inclined from two sides, one of the sides being longer than the other, as is plainly shown in Fig. l, so that the two openings S2 of the two troughs are placed a suitable distance apart, as shown. The two troughs S and S are secured in a frame S3,supported on springs S4, attached to the ends of the casing A. Eccentric-rods 'l are also connected with the said frame S", and are fastened on the cccentries 'l", secured on the main driving-shaft B. \Vhen the latter is turned, the trough-frame S, carrying the said two troughs S and S', is moved forward and backward-that is, the troughs receive a shaking motion similar to that of the bolt E. The end of the bolt E discharges into a channel U, formed on one end of the easing A and leading to a spout U', discharging on one end of the easing A, as shown in Figs. 1 and 2.

The operation is as follows? Then the feedhopper I has been charged andthe gate I'l adj usted and the machine is set in motion by rotating the shaft B, the stock passes out of the feed-hopper I onto the bottom I', which moves the material into the interior of the casing A, in which it `is taken up and distributed through the upper part of the casing A by the air sucked in between the slats O a-nd passes upward to the fan K by the suetion of the latter. The dust and other impurities pass upward on account of their lightness, and finally settle into the top or wide ends of the dust-catchers J, which lead the dust into the troughs F, and as the latter receive a shaking lnotion the dust moves in the said conveying-troughs F until it is finally deposited in the spoilt G, discharging into the exterior spout Il, leading to the floor. As the forward sides of the dust-catchers are slotted vertically, a free and unobstructed entrance for the dust is provided,and the shape of the slots prevents their being clogged by dust or particles of bran. The slots J' are widest at the bottom, where the draft is not so great, and contracted at their upper ends, where the draft is strongest, so that only the dust will be drawn therethrough. The rear closed sides of the dust-catchers incline forwardly, and thus the dust is permitted to slide freely down into the dust-spouts, there being insufficient draft at said rear sides to prevent the ready descent of the dust. The draft in the interior of the casingA is regulated by the gates L by adjusting the crank-arms L2 011 the sides of the casing A. The stock passing onto the bolt E passes through the cloth E' in the usual manner, the cloth being constantly cleaned by the traveling brushes N, the stock passing downward onto the inclined sides P and finally passing into the trough P', froln which it may be discharged into either of the two troughs S or S' by changing the gates Q, as previously described. The discharge from the end of the bolt E passes into the channels U and from the latter into the troughs U', leading to the outside.

Having thus fully described myinvention, I claim as new and desire to secure by Letters Patentl. The combination, in a middlings-puri- Iier, with the parallel reciprocating troughs, of longitudinally-aligned conical collectors IOO IIO

opening at their lower smaller ends into said troughs and having their forward sides provided with slots J', substantially as set forth.

2. The coinbination,with the casin g A, having a cover A', t-he air-channel A2 Within the cover, and the blower or fan communicating with said channel or passage, of the pairs of 4 conical dust-collectors J, slotted in their forward sides, each pairhaving a transverse plate J2, said plates forming the bottom of v said air-channel, the parallel reciprocating dust troughs F, into which the lower smaller ends of the collectors discharge, and the shaking screen under said troughs, substantially as set forth.

3. In a 1niddlings-purier, the combination,

by and connected with the frame S3, substantially as set forth.

JOHN A. WAHLSTROM. Witnesses:

ROBERT C. HAssoN, I. M. BELKNAP. 

